Deterioration of Blast Furnace Coke by CO&lt;SUB&gt;2&lt;/SUB&gt; Gasification

Nishi, Tetsu; Haraguchi, Hiroshi; Miura, Yoshiaki

doi:10.2355/tetsutohagane1955.70.1_43

Cited by 12 publications

(7 citation statements)

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“…Moreover, they attributed the high post-reaction strength of low CRI coke to the assumption that the coke reaction occurred preferentially on the surface of the coke and that of high CRI coke to the assumption that CO 2 enters the inner part of the coke, which disperses the reaction through the entire particle. This comment is different from the view by Nishi et al 11,12) and Yamaguchi et al 9) attributed this difference to a difference in the reaction condition; in Yamaguchi's study the reaction was conducted at an increasing temperature and in Nishi's study the reaction was conducted at a constant temperature.…”

Section: Introductioncontrasting

confidence: 53%

“…It is reported that some of the coke surface disappears as a result of the reaction and that the thickness of the disappeared part decreases with decreasing the weight loss percentage. 11) In this study, since the weight loss percentage is as low as 20 % and constant, the analysis was conducted assuming that the coke surface does not disappear as a result of the reaction. Table 3.…”

Section: Evaluation Of Porosity Distribution In Cokementioning

confidence: 99%

“…Moreover, considering that a highly reactive coke would decrease the thermal reserve zone temperature in an actual blast furnace, it is necessary to study the effect of the reaction temperature on the postreaction strength of the catalyst added coke; however, this is unclear. It is reported 8,11,[14][15][16] that there is a reaction degree gradient (porosity gradient) inside the coke lump. It is also reported that at a higher reaction temperature the coke reaction occurs preferentially on the surface of the coke with the inner part of the coke lump being kept nearly unreacted.…”

Section: Introductionmentioning

confidence: 99%

“…[8][9][10] Nishi et al 11,12) proposed a coke structure that is resistant to breakage after reaction: the coke of which the reaction follows the unreacted-core reaction model (the coke with highly reactive carbon structure and low porosity, e.g. formed coke) and the homogeneous reaction model (the coke with less reactive carbon structure, high porosity and thick coke structure wall).…”

Section: Introductionmentioning

confidence: 99%

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Post-reaction Strength of Catalyst-added Highly Reactive Coke

2007

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The development of production and utilization technology for highly reactive coke is significant in order to improve blast furnace reaction efficiency. In this report, the post-reaction strength of catalyst-added highly reactive coke was investigated. The reaction between coke and CO 2 was stopped at a weight loss of 20 % and the reaction temperature was adjusted so that the reaction lasted for a constant period. In this experimental condition, the reaction temperature of highly reactive coke was lower than that of normal coke, which corresponds to the decrease in the thermal reserve zone temperature in a blast furnace. First, a decrease in reaction temperature made the reaction of the catalyst added coke more homogeneous, which increased the post-reaction strength of the highly reactive coke produced by the post-addition of catalyst to coke method; however, it decreased that of the highly reactive coke produced by the pre-addition of catalyst to coke method. Secondly, the post-reaction strength of catalyst-added highly reactive coke produced by the post-addition of catalyst to coke method became equal to or greater than that of normal coke. The types of catalysts and the catalyst adding method affect the porosity distribution in the coke after reaction and hence the post-reaction strength of coke to a great extent. Suitable selection of catalysts and its addition method to coke leads to highly reactive coke with post-reaction strength greater than that of normal coke. Catalyst-added highly reactive coke is a promising material to improve blast furnace reaction efficiency.

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Section: Introductioncontrasting

confidence: 53%

Section: Evaluation Of Porosity Distribution In Cokementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Post-reaction Strength of Catalyst-added Highly Reactive Coke

2007

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“…Cold strength after carbonization (drum strength DI) and strength after hot reaction (CSR: 141) Coke Strength after-CO2 Reaction) were specified as important indexes for evaluating coke quality, and technologies for manufacturing high strength coke by blending a wide range of different brands were studied. The JIS reactivity index, which expresses reactivity at low temperature (950°C) and the Coke Reactivity Index (CRI), which expresses reactivity at high temperature (1 100°C), were used for reactivity.…”

Section: Improvement Of Coke Qualitymentioning

confidence: 99%

Ironmaking Technology for the Last 100 Years: Deployment to Advanced Technologies from Introduction of Technological Know-how, and Evolution to Next-generation Process

Naito

Takeda²,

Matsui³

2015

ISIJ International

106

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The 150 year history of the Japanese steel industry dates from the first western blast furnace, which was built by T. Ohashi in 1857. Modern blast furnace operation at integrated steel works in Japan started in 1901 with the first blow-in of Higashida No. 1 blast furnace at Yawata Steel Works. Throughout the prewar and postwar periods, the steel industry has supported the Japanese economy as a key industry which supplies basic materials for social infrastructure and development.After the period of recovery following the destruction caused by World War II, Chiba Works of Kawasaki Steel Corporation (now JFE Steel Corporation) was built and began operation in 1953 as the first integrated steel works in the Keiyo Industrial Region after the war. During Japan's period of high economic growth, many coastal steel works with large blast furnaces having inner volumes of more than 3 000 m 3 and even 5 000 m 3 were built to enable efficient marine transportation of raw materials and steel products. Japanese steel makers introduced and improved the most advanced technologies of the day, which included high pressure equipment, stave cooler systems, bell-less charging systems, etc. As a result, Japanese steel works now lead the world in low reducing agent rate (RAR) operation, energy saving, and long service life of blast furnaces and coke ovens.Following the Oil Crises of the 1970s, the Japanese steel industry changed energy sources from oil to coal and implemented cost-oriented operation design and technology. In 2012, the Japanese steel industry produced approximately 80 million tons of hot metal from 27 blast furnaces, including large-scale furnaces with inner volumes over 5 000 m 3 . During this period, the industry has faced many economic and social challenges, such as the high exchange rate of the yen, oligopoly in the mining industry, global warming, and the surge in iron ore and coal prices driven by the rapid growth of the BRICs. The industry has successfully responded to these challenges and maintained its international competitiveness by developing advanced technologies for pulverized coal injection, expanded use of low cost iron resources, recycling for environmental preservation, and CO2 mitigation.In this paper, the prospects for ironmaking technologies in the coming decades are described by reviewing published papers and looking back on the history of developments in ironmaking during the last 100 years.

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